Situation Right Before Commutation - Motorola M68HC08 Manual

Low power bldc drive for fans using the mc68hc908qy4 reference design

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DRM046 — Rev 0

MOTOROLA

Freescale Semiconductor, Inc.

The commutation is repeated per each 60 electrical degrees. The

commutation event is critical for its angular (time) accuracy. Any

deviation causes the torque ripples and hence speed variation.

Figure 3-7. Situation Right Before Commutation

Figure 3-8. Situation Right After Commutation

BLDC Motor Theory

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BLDC Motor Theory

Commutation

Designer Reference Manual

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